Use a closure:
my $stats = [];
my $code = create_closure( $stats );
....
$pm->run_on_finish( $code );
....
print Dumper( $stats );
sub create_closure {
my( $stats ) = @_;
return sub {
my ($pid, $exit_code, $ident) = @_;
push( @$stats, {
pid => $pid,
exit_code => $exit_code,
ident => $ident
} );
}
}
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